Abstract
Shape memory alloys (SMA) are a promising material class for active lightweight structure applications with movement functionality. Due to their high activation energy potential and good processability in wire shape, they are well suited for application in actively deformable, fibre-reinforced composite structures. In order to generate large deflections from the limited deformation potential of SMA, detailed analysis of the deformation mechanisms is required. In this work, a bionic approach is pursued, investigating the characteristics of locomotion systems of insects. A simplified joint concept is derived from the cockroach knee and implemented using flat knitting technology. A composite joint is manufactured with a resin infusion process and experimentally verified in regards to its motion behaviour. The presented results show good deformation behaviour with large deformation angles up to 60°, suggesting large potential for further development of the presented approach.
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